Re: Theorizing: what can be done with DOT clock signal present on C64 expansion port?

From: André Fachat <afachat_at_gmx.de>
Date: Fri, 05 Nov 2021 22:47:48 +0100
Message-ID: <17cf21273a0.27ff.b4d1f2b66006003a6acd9b1a7b71c3b1_at_gmx.de>
I use it to delay the rising edge of phi2 so I can use a 6522 VIA on the
expansion port.

The VIA requires the address lines valid at the rising edge of phi2, what
the c64 does not have, as the VIC2 uses the first half of the cycle.

Am 3. November 2021 19:52:34 schrieb Claudio Sánchez <tokafondo_at_gmail.com>:

> Ideas:
>
> - Create a secondary display card with a VIC-II that would use
>   its own memory.
>
> - Create a secondary sound card that would play digital sound
>   alongside the SID.
>
> - Create a math coprocessor that would accelerate programs or games
>   that use intensive number crunching.
>
>
> ...all of it in sync with the rest of the system.
>
> What do you think?

But I guess you meant something more interesting:-)

André
Received on 2021-11-05 23:02:46

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